A center by any other name… Geogebra at work

February 6, 2011 at 7:19 pm Leave a comment

Recently I was asked how one finds the center of a scalene triangle. There are in fact four possible answers to this question. Below I’ve recorded 5 screencasts on how to use Geogebra to investigate the properties of each type:

  1. Properties of an incenter (the intersection of the three angle bisectors).
  2. Properties of a circumcenter (the intersection of the three perpendicular bisectors).
  3. Properties of a centroid (the intersection of the three segments connecting each vertex with the opposite bisector).
  4. Properties of an orthocenter (the intersection of the three altitudes).
  5. Releationships between the four centers.
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Entry filed under: Uncategorized.

Keeping track… Screencasting the easy way

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